The children had been described as "vivacious, sensational and beautiful” children by neighbors and Koda, who was due to start kindergarten this year, was often seen helping his father gardening with toy tools and wheelbarrow.

Port Lincoln Mayor Bruce Green said the community was in shock.

“First there is a sense of disbelief and then it moves to grief,” he said.

“The community will still be digesting the event and coming to terms with the tragedy."